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Grim is sued for dereliction of duty by his old rival, the Boogey Man, having failed to reap General Skarr thanks to an intervention from Billy and Mandy. Grim and the children (includin Irwin) are set to be exiled by the Underworld Court and placed in the custody of Boogey. Numbuh 3 of the Kids Next Door is the court-appointedGrim Reaper. Boogey reveals his plan is to steal Horror's Hand, an object capable of transforming its holder into the scariest and most powerful being in existence. The group eventually escapes and plans to obtain the hand for themselves for various reasons (Grim believes this will get him his job back, Mandy sees it as the way to conquer the world, Irwin thinks it will help him win Mandy's heart and Billy just wants to use it to get a candy bar).

Both groups eventually reach where the hand is held, where they meet Horror the Ancient, a living statue that cut off his hand having placed his fears within it. To obtain the hand, two rivaling groups must embark on a race across the Cannibal Run - the most dangerous section of the River Styx - as well as facing their worst fears. Grim and the children win and scrape to obtain the hand. Billy, Irwin and Mandy are easily subdued by their worst nightmares, leaving Grim to claim the Hand, as he lived his worst nightmare everyday - living with Billy and Mandy. The hand however is almost immediately stolen by Boogey who apparently scares Grim to pieces, but Grim revealed he blew himself up on purpose. Boogey turns out to be incapable of facing his worst fear, realizing that he is not at all scary. He suffers amnesia after a series of accidents, and ends up afraid of everything and everyone. Grim is reinstated as the Grim Reaper, partly because Numbuh 3 was too much of an airhead to actually reap anyone.. In the end, a naked, cut up Billy from two weeks in the future appears before them to warn that if Mandy had used Horror's Hand, she would have taken over the world in two weeks, becoming the Lord of Horror from his time. Grim decides to put the hand in his trunk to ensure that that future doesn't come to pass. Future Billy eventually goes back to the future to make sure that things were set right. The credits roll, showing the aftermath for each character.

The epilogue shows how Billy went back to the future, and finds that Fred Fredburger obtained Horror's Hand from Grim's magic trunk and took over the world as the new Lord of Horror.

Creating the film was the first time that Maxwell Atoms had created anything with a length of over one hour. That, along with creating the regular season was challenging for him. Boogey Man was chosen as the villain for the film because he was a lesser villain that had a relationship with Grim. This was because Atoms was given the idea to follow a storyline similar to Star Trek II: The Wrath of Khan by a Cartoon Network representative. The role of Numbuh Three was originally supposed to be taken up by Pamela Anderson, but she did not take the part. Afterwards, he decided to use Numbuh Two, who is innocent, as a sneak preview of The Grim Adventures of the Kids Next Door, but ended being suggested by Tom Warburton that Numbuh Three be used instead. Atoms also used some Nintendo cameos in the later part of this TV movie, such as when Boogey Man kidnaps Mandy he makes a "warp pipe" appear and its SFX is used when he goes into it[1]

The title track "Land of the Dead" was written and performed by Voltaire. It is Voltaire's second collaboration for The Grim Adventures of Billy & Mandy, the first being on the episode "Little Rock of Horrors" with the song "BRAINS!".

The DVD was released on April 3, 2007, in the USA. The DVD contains both anamorphic wide screen and modified full screen versions with 5.1 surround sound and regular stereo sound. Special features include the original "Bully Boogie" episode that Boogey originally debuted in and interviews with the voice actors.[2]

The movie received positive reviews from critics. Dennis Prince of DVD Verdict reviewed the movie saying, "All told, Billy & Mandy's Big Boogey Adventure is a gift from Atoms, and an indulgence of all the goodness and gooeyness that has made the series a top draw on Cartoon Network. Despite the boogers, bare buttocks, and boorish humor, this court finds no real crime has been committed. Case dismissed".[2] MaryAnn Johanson, of The Flick Filospher reviewed the movie saying "'Full-length movie. Full of boogers!' promises the blobby green sticker on the DVD. And it's true. But somehow, the tons of gross-out potty humor manages to be delightfully goofy -- perhaps it's the irresistibly cheerful spin cartoonist Maxwell Atoms puts on his demented twisting of kiddie cartoons"[3] It was nominated for an Annie Award for Best Music in an Animated Television Production.[4]